Gigabit uplinks questions

Answered Question
Nov 18th, 2008

Hi,

I have a 3750 with a gigabit rj45 SFP, and I am planning on connecting it to a gigabit port on a 6509 and running it at gigabit speed.

My questions are:

-do I need a crossover cable to do this?

-does it need to be a special cable for gigabit crossover?

-could I enable MDIX or will it not work because the 6509 will not support this?

Any help would be much appreciated!

Thanks,

J

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Correct Answer by glen.grant about 8 years 2 months ago

MDIX will work if you leave the 3750 speed/duplex set as auto, it will not work if you attempt to use a hardcoded speed/duplex. Gigabit needs all 4 pairs to run gigabit speed so all 4 pairs must be ok. The 6509 end should also be set as auto.

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Correct Answer
glen.grant Tue, 11/18/2008 - 07:22

MDIX will work if you leave the 3750 speed/duplex set as auto, it will not work if you attempt to use a hardcoded speed/duplex. Gigabit needs all 4 pairs to run gigabit speed so all 4 pairs must be ok. The 6509 end should also be set as auto.

bberry Tue, 11/18/2008 - 07:47

I have always used a crossover cable for the switch to switch connections. A Cat6 would probably be best but given a short distance between the two a Cat5 should work as well.

Brent

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